gMax 2 Dual 2in1 Firmware Marlin 1.1.9 (SSR and Regular) 210708

License Type
Original Authors License
Compatible With
gMax 2
Marlin 1.1.9 Firmware for gMax 2 Dual 2in1

Zip file contains firmware for printers with the SSR relay as well as the original IoT relay. Make sure to choose the correct firmware when installing. Max temp of hotend is 243° C. DO NOT EXCEED THIS TEMPERATURE.

Update 07/08/2021 :
+Modified settings for Dual 2in1 Hotend

Used on the gMax 2 3d printer with the dual 2in1 hotend.

Modifying the firmware is for advanced users and it not recommended. Making changes to the firmware could cause damage to your printer not covered under warranty. We recommend just uploading the .hex file


The new firmware includes .hex files and you can simply upload using xLoader, PrusaSlicer or Cura slicing software.

We recommend using xLoader to install firmware. Make sure to set baud rate to 115200

Refer to this tutorial for a simple walk through on installing firmware with Cura:

If you are uploading via the Arduino environment, we recommend using version 1.9.0. Also make sure to have the u8glib library installed. We recommend version 2.24.3

Thank You

The original Marlin github can be found here:
Marlin Github changelog:

Do not use the configuration files for the gMax found on the github page. Always download the gMax firmware found on our forum to ensure it works on your printer.

A huge thank you to the entire Marlin Development team. We will be incorporating our changes to the Marlin github and as always our source code is available in the .zip file.
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